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NOVA - Deadliest Tornadoes

Deadliest Tornadoes Deadliest Tornadoes
Why was the 2011 tornado season in the U.S. so extreme, and why did so many die?
http://video.pbs.org/widget/partnerplayer/2220853400/?player=WGBY-PBS&w=512&h=288&chapterbar=true&autoplay=false Why was the 2011 tornado season in the U.S. so extreme, and why did so many die? /episodes/get/2339 /episode/2339 NOVA: Deadliest Tornadoes /episode-player/2339
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